Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

NSW alleged murderer found mentally unfit

A man accused of stabbing a stranger at a bus stop in an unprovoked attack is unfit to stand trial for murder, a Sydney judge has ruled.

Geoffrey Webber, 26, is accused of stabbing 24-year-old Luke Aaron Robins to death with a 30 centimetre kitchen knife as Mr Robins waited for a bus at Brookvale in Sydney's northern beaches on May 2 last year.

The Crown alleges Webber, who had never met Mr Robins before, stabbed him in the chest in front of several witnesses as Mr Robins struggled and yelled, "Help me, help me".

When Mr Robins fell to the ground, Webber allegedly straddled him and stabbed him again, pushing the blade further into his chest before covering Mr Robins' nose and mouth.

He then jumped up and boarded a bus after waving the bloody knife at the driver.

Several shocked onlookers called police who chased Webber on to the bus where a further struggle ensued.

After he was arrested, officers said Webber "smiled and made grunting noises".

Webber has since been diagnosed with "severe paranoid or catatonic schizophrenia".

One psychiatrist who assessed him found that "although (he) had shown some signs of improvement, he was still psychotic and may well struggle to appreciate his legal situation, give instructions, accept legal advice and follow what was said in court".

In a judgment handed down last month, Justice Peter Hall found Webber was unfit to stand trial and he referred the matter to the Mental Health Review Tribunal.